#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include<math.h>
int main()
{
    float a, b, c;
    while (scanf("%f%f%f", &a, &b, &c) != EOF)
    {
        if (a == 0)
        {
            printf("Not quadratic equation\n");
        }
        else
        {
            if ((b * b - 4.0 * a * c) == 0)
            {
                printf("x1=x2=%.2f\n", -b / (2 * a) + 0);
            }
            else if ((b * b - 4.0 * a * c) > 0)
            {
                printf("x1=%.2f;x2=%.2f\n", (-b - sqrt(b * b - 4 * a * c)) / (2 * a), (-b + sqrt(b * b - 4 * a * c)) / (2 * a));
            }
            else
            {
                if (b != 0)
                {
                    printf("x1=%.2f-%.2fi;x2=%.2f+%.2fi\n", -b / (2 * a), sqrt(-(b * b - 4 * a * c)) / (2 * a), -b / (2 * a), sqrt(-(b * b - 4 * a * c)) / (2 * a));
                }
                else if (b == 0)
                {
                    printf("x1=0.00-%.2fi;x2=0.00+%.2fi\n", sqrt(-(b * b - 4 * a * c)) / (2 * a), sqrt(-(b * b - 4 * a * c)) / (2 * a));
                }
            }
        }
    }
    return 0;
}